/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-hover: #059669;
            --bg-base: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #64748B;
        }
        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            overflow-x: hidden;
        }
        .header-scrolled .nav-top-row {
            height: 0;
            opacity: 0;
            padding-top: 0;
            padding-bottom: 0;
            overflow: hidden;
        }
        .header-scrolled .nav-container {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.08);
        }
        .live-pulse {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(1.15); }
        }